How to get down the idle on my 57mm TB's?

[mini_me]

Here's the deal; today I fitted 57mm TB's. They are the new type TB's of a 2006 Tuono and I modified them to take the old Denso injectors. I also swapped the throtle and fast idle mechanism from my old 51mm TB's.

Problem is that (when warmed up) it idles at 1600-1700 RPM.

1) I have completely screwed back the stop screw that is used to fix the resting point of the butterfly valves to make sure that it doesn't raise the idle.
2) I have taken out the fast idel adjustent cable (the round know on the righthand side of the fueltank
3) I have completely closed the brass bypass screws.
4) the is enough free play in all the cables (2x throttle and 1x fast idle lever)
5) I have checked als the various vacuum hoses for leaks.

Both trimpots are at the stock 12 o clock position.

Any ideas on how to get down the idle?

[FTM]

Fit some 51's.

[mini_me]

Sometime the solution is so obvious that one can'tsee it...

[Striptyler]

I would have to assume that the 57mm body will pass more air when at the idle stop. I'd also assume that it is running lean at idle.

Do you have a custom map for it yet? you're getting into the realm of significant changes at this point... and that can change a lot about the way the bike runs.

If you're running excessively rich at idle, it may run oddly at idle. Is there hesitation upon acceleration? also, what is the TPS reading now? is there any chance that the TPS has changed? maybe now the bike thinks your at partial throttle or something.

[mini_me]

Don't think TPS has changed as the OEM locktite is still in place. Will check the TPS readout but as said the idle stop has been turned way back.

Apart from high IDLE bike runs great.

[GREYOZ]

have you blocked off the top of said TB,s to see if the idle changes, this might isolate some thing or not
Are they in sync with each other.

[Gtrain]

Mm, don't know the answer but,,


have just read derbybrits exploits with fitting a new (2007) big bore motor with 57's to he's first gen touno.

To get the 57's to work, he had to get a new chip done up so the Denso ecu could use all that they had to offer.

he might have clues to solve your issues?

[BrummyMax]

Shit, I am doing this next week, so I hope I don't get these problems.




Did you block off the 2 large vacuum elbows on the RHS of the casting?
Or did you remove them entirely from your casting?
Did your throttle cable mechanism look different to the one above? These are a set of 2004 RSV throttle bodies.

[mini_me]

Hey max, I kept the vacuum ports. I simply blocked them with some heatschrink tubing used in electronics. But you can also tape them up or whatever you need to do to block them.

The mechanism looks like it still has the mechanical fast idle lever connection so you should be good. Hard to see without a pic from the top of the TB.

Are you planning on changing the new injectors for old ones or do you plan to keep the new ones and go down the PC3 route?

[BrummyMax]

I am going down the old injector, adjustable pressure regulator and pc3 route. I am looking closely to see if you solve your problem though. I have ordered some 57mm Tuono 06+ velocity stacks. As soon as they arrive I will fit the lot and report back here. I have no problem sharing advanced Tuono information with Falco riders

[Striptyler]

Don't think TPS has changed as the OEM locktite is still in place. Will check the TPS readout but as said the idle stop has been turned way back.

Apart from high IDLE bike runs great.

Sorry, I guess I wasn't clear, but was wondering if the actual TPS sensor is different. Like, as in it reads at a different value for the same setting.

[BrummyMax]

Sorry, I guess I wasn't clear, but was wondering if the actual TPS sensor is different. Like, as in it reads at a different value for the same setting.

Nope, its the same sensor on all 98-09 RSV's, 02-09 Tuonos and Falco's. Aprilia part number 0274030

[mini_me]

I am going down the old injector, adjustable pressure regulator and pc3 route. I am looking closely to see if you solve your problem though. I have ordered some 57mm Tuono 06+ velocity stacks. As soon as they arrive I will fit the lot and report back here. I have no problem sharing advanced Tuono information with Falco riders

Adjustable pressure regulator and PC3 arn't required when using the old denso's.

I will solve the problem, no big deal. Just use a griptang

I am using the TB's and the stacks of a 2 ohno. So my bike is part hooligan now. Won't be long before I start misbehaving I guess.

ps Nothing advanced about a Tuono m8, only hooligan.

[BrummyMax]

Adjustable pressure regulator and PC3 arn't required when using the old denso's.

They are if you want to take full advantage of the 57's. I have a 2-2 race system, open airbox, early air boot, Gabro chip with advanced ignition and an 03 Mille engine (slightly larger intake valves, higher lift cams). This bike needs a PC3. The fuel pressure regulator just gets the bike running as sweet as possible from the Gabro Chip, before fine tuning with the PC3.

[mini_me]

They are if you want to take full advantage of the 57's. I have a 2-2 race system, open airbox, early air boot, Gabro chip with advanced ignition and an 03 Mille engine (slightly larger intake valves, higher lift cams). This bike needs a PC3. The fuel pressure regulator just gets the bike running as sweet as possible from the Gabro Chip, before fine tuning with the PC3.

No need to tell me about the race 2 in 2, my hearing is still recovering